Stable Graphene Membranes for Selective Ion Transport and Emerging Contaminants Removal in Water

Siva Nemala Sankar; Joao Fernandes; Marilia Barreiros dos SantosBegona EspinaPedro AlpuimAnder Garcia DiezSenentxu Lanceros-MendezLalita SainiSuvigya KaushikGopinadhan KalonAndrea Capasso

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Stable Graphene Membranes for Selective Ion Transport and Emerging Contaminants Removal in Water

机译：Stable Graphene Membranes for Selective Ion Transport and Emerging Contaminants Removal in Water

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Carbon-based materials, such as graphene oxide and reduced graphene oxidemembranes have been recently used to fabricate ultrathin, high-flux, andenergy-efficient membranes for ionic and molecular sieving in aqueous solution.However, these membranes appeared rather unstable during long-termoperation in water with a tendency to swell over time. Membranes producedfrom pristine, stable, layered graphene materials may overcome these limitationswhile providing high-level performance. In this paper, an efficient and“green” strategy is proposed to fabricate μm-thick, graphene-based laminatesby liquid phase exfoliation in Cyrene and vacuum filtration on a PVDF support.The membranes appear structurally robust and mechanically stable,even after 90 days of operation in water. In ion transport studies, the membranesshow size selection (>3.3 A) and anion-selectivity via the positivelycharged nanochannels forming the graphene laminate. In antibiotic (tetracycline)diffusion studies under dynamic conditions, the membrane achieverejection rates higher than 95%. Sizable antibacterial properties are demonstratedin contact method tests with Staphylococcus aureus and Escherichiacoli bacteria. Overall, these “green” graphene-based membranes represent aviable option for future water management applications.

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《Advanced functional materials》 |2023年第23期|2214889.1-2214889.13|共13页
作者
Siva Nemala Sankar; Joao Fernandes; Marilia Barreiros dos SantosBegona EspinaPedro AlpuimAnder Garcia DiezSenentxu Lanceros-MendezLalita SainiSuvigya KaushikGopinadhan KalonAndrea Capasso;
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International Iberian Nanotechnology Laboratory4715-330 Braga, Portugal;

International Iberian Nanotechnology Laboratory4715-330 Braga, Portugal Center of Physics of the Universities of Minho and PortoUniversity of MinhoCampus de Gualtar, 4710-057 Braga, Portugal;

BCMaterials, Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park, 48940 Leioa, SpainBCMaterials, Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park, 48940 Leioa, Spain IKERBASQUEBasque Foundation for ScienceBilbao 48009, SpainDiscipline of Physics and Discipline of Materials EngineeringIndian Institute of Technology GandhinagarGandhinagar, Gujarat 382355, India;

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anti-fouling; bacterial adhesion; liquid phase exfoliation; pristine graphene; water management;

Stable Graphene Membranes for Selective Ion Transport and Emerging Contaminants Removal in Water

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